The project is very simple but important for me .Have been working with it almost 4 days. I can open other projects without problem. I had a similar problem before.In both cases accidentally i was working in the AE timeline without notice that I had the Proanimator plugin open. So when I realized , AE crashed and projekt can't open anymore. I'm just a beginer trying to learn to use this fantastic software. Please, help.

Yes this can be a real pain. As far as I'm aware, once a ProAnimator project has crashed it is pretty much dead. As a beginner you need to start thinking about ways of working that ensure you have a backup. Things like turning on Auto-Save, doing Incremental backups etc. You can't work for 4 days on a project without saving incremental versions of your project, if you do you are bound for trouble (as you have discovered) when the project file won't open.